LONDON (Reuters) - The United States' army chief of staff said he was very concerned about falling British defense spending and that cuts had forced an urgent review of how Britain's troops could be deployed alongside U.S. forces in future conflicts.

In an interview with the Daily Telegraph newspaper published on Monday, Army Chief of Staff General Raymond Odierno urged Britain to maintain defense spending at 2 percent of national output, warning that British forces could end up fighting inside U.S. units rather than alongside them.